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I took the NYT quote from Eduardo Romano to mean that after controlling for some of those confounding factors, there was no evidence of increased risk. I posted the NYT article because the abstract didn't mention much about marijuana specifically.

Specifically, drivers who test positive for marijuana or self-report using marijuana are more than twice as likely as other drivers to be involved in motor vehicle crashes.

Without having read the study, do you know if this statistic controls for age or anything else? If so, I stand corrected.

Thanks for your polite tone, it's not every day I get called a "fucking moron" before 7 a.m. :)

Like I said, I think the NYT quote confuses two points - no evidence for increased driver fatalities; and evidence for increased number of accidents. While I can understand how you made the inference you did, as I pointed out, elsewhere in the same NYT article points out that the accident rate is 2x that of other drivers, so there is an internal inconsistency. The simplest correction which makes it match external evidence is assume that the Romano quote omitted the "fatal" accidents context.

The study I linked to says: The data were stratified and analyzed according to study design, type of drug assessment, study time period, study location, or age of the study subjects. A more than 2-fold increased crash risk associated with marijuana use was found in each of the subsets of studies

Table 2 shows the age breakdown as "<25" and "all ages." See http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3276316/table/tb... .

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